Heating and ventilating buildings : a manual for heating engineers and architects . s those for the inlet; the register should be of ample size, theopening should be gradually contracted into the flue, and everyprecaution should be taken to prevent friction losses. 36. Ventilation-flues.—The size of ventilation-flue willdepend to a great extent uponthe character of system adopted,but will in all cases be computedas previously explained. A prac-tical system of ventilation gener-ally is intimately connected witha system of heating, and the vari-ous problems relating to the sizeand construction o
Heating and ventilating buildings : a manual for heating engineers and architects . s those for the inlet; the register should be of ample size, theopening should be gradually contracted into the flue, and everyprecaution should be taken to prevent friction losses. 36. Ventilation-flues.—The size of ventilation-flue willdepend to a great extent uponthe character of system adopted,but will in all cases be computedas previously explained. A prac-tical system of ventilation gener-ally is intimately connected witha system of heating, and the vari-ous problems relating to the sizeand construction of ventilatingducts will be considered later. Ingeneral the ducts should be ofsuch an area as not to require ahigh velocity, since friction andis to a great extent due to thiscause. The size of the ventilatingduct can be computed, knowingits rise, length, and the differ-ence of temperature by dividingthe total amount to be discharged Fig. 23.— the amount flowing through one square foot of area of theflue under the same conditions. (See Table XVI, Appendix).. 60 HEATING AND VENTILATING BUILDINGS. In introducing heated air into a room, it is very much bet-ter to bring in a large volume heated but slightly above therequired temperature of the room rather than a small volumeat an excessively high temperature. If the temperature of theair entering be 25 degrees above that of the air in the room,the discharge in a flue one square foot in area would be, incubic feet per second, for a height of 10 feet, for aheight of 25 feet, for a height of 40 feet, if no loss fromfriction, as given in Table XVI. The actual discharge can besafely taken as 50 to 60 per cent of the theoretical. As the difference of temperature of the air in the roomand outside may usually be taken as 200, the velocity in feetper second for heights corresponding to the distance of floorto roof in a building of 3 stories would be about as follows :1st floor, 5 ; 2d floor, 4; attic or to
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